Implemented the requested change.  Refs #6650.
Fix a bug to count number of splitted workspaces.  Refs #6650.
Do some mod for debug on MacOS.  Refs #6650.
Try to figure out Mac failure.  Refs #6650.
Still try to figure out Mac failure.  Refs #6650.
Fix an error.  Refs #6650.
Merge the changes on Feb 7 and 8.  Refs #6650.
Merge branch 'feature/6650_powder_redux' into develop